How do I write an regular express to find out if a filename contains ".pdf" at the end of the filename?

How do I write a Perl regular express to find out if a filename cont开发者_开发问答ains a specific extension, for example ".pdf". The filename can be anything.

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Something like this?

if ($filename =~ /\.pdf$/) {
    // Do stuff
}   

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Test the filename using the following regular expression: \.pdf$

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You don't, explode/split on the . and use the last item in the array/collection. This is usally better/faster than using a regex.